Optimizing Large Dynamic Arrays in TanStack Form

Illustrate advanced techniques for optimizing the performance of TanStack Form when managing large dynamic arrays, including strategies for efficient state updates.

import { useFieldArray, useForm } from 'tanstack/react-form';

function MyForm() {
  const form = useForm({
    defaultValues: {
      items: [], // Initialize your dynamic array here
    },
  });

  const items = useFieldArray({
    form,
    name: 'items', // Path to your field array in the form state
  });

  // Function to efficiently update an item in the array
  const updateItem = (index, newItem) => {
    items.update(index, newItem);
  };

  // Function to add a new item
  const addItem = (item) => {
    items.push(item);
  };

  // Other functionalities like removing an item can also be added similarly

  return (
    // Render your form UI here
  );
}

This piece of code demonstrates the use of TanStack Form's useForm and useFieldArray hooks to manage a dynamic array of items within a form. It specifically shows how to initialize the dynamic array, and efficiently add or update items using the provided methods from useFieldArray, which is crucial for optimizing performance with large data sets.